A major change to the Upper West Side retail landscape is rumored. My Upper West tipster Jim C. reports that the Lincoln Triangle Barnes & Noble (Broadway at 66th) will be closing its doors by the end of the year. The closing, which was confirmed with the customer service representatives at the store, is allegedly due to the landlords driving up costs beyond what the store can afford. What is planned in its place? The ginormous discount clothing store, Century 21. The addition of a Century 21, a store that pulls thousands of locals and tourists in each day to the downtown location, is sure to add to the Upper West Side crowds, as another wildly popular chain will be added to the list of openings like the UWS Apple store and Trader Joe’s.